Driving mechanism.



I. S. DEMENT.

DRIVING MECHANISM.

A l D 19 APPL 9'6- 1,235,538. Patented July 31, 191-7.

. 2 EEEEEEEEEEEE I.

I I I 3 I nrromvzy I. SQDEMENT.

DRIVING MECHANISM.

APPLICATION FILED 0 CT. I9 1916.

2 SHEETS-SHEET 2- [NV/5N TOR.

\ V [900033 352 I I If)": I, I

UNITED STATES jection.

member is rem-arsed.

To all whom it may concern:

- Be it knownthat Lilsaao S. 'Dmrmv'u, a citizen of the. United States, resldlng; at

-I):iyton, in the county of Montgomery and This invention relates to driving l'necha- 'nism and is designed more particularly to take the place of the compensatinggearing ordinarily employed in motor drivenxvehicles, to permit of the relative movement 0 the two driving wheels. i

As isiwell known, the ordinary compensating gearing is open to at least one serious ob- It causes the larger part of the powerto be applied to that wheel to the movement oflwhich the less --resistance is oil'ered, thus frequently preventing themovelnent ofisuch a vehicle under its own-power, where such movement would be easily accomplished if thepower were applied equally to both wheels, or to the wheel to which the greater resistance "as ofl'ered. I v

The object of the present invention is to provide a compensating mechanism which will apply the power tothat wheel having the slowest movement; and to provide such a meehanisl'n which will be of a simple, durable cl'iaractcr, and which will be positive in its operation. i

. To this end a further object of the invention is .to provide such a mechanisnrhaving driving pawls which will be positively shifted from one position to the other when the direction of the movement of the driving Theother objeots'of the invention will appear as the mechanism is described in detail.

In the accompanying drawings Figure 1 is a side elevation of a mechanism embodying my invention, Withthe driving gear partly broken away; Fig. 2 is a sectional view taken centrally through the same; Fig. .3 is a side.elevation of the actuating device and its pawls; Fig. i is a side elevation, partly bro (en away, of a different embodiment of the invention; Fig. 5 is a vertical sectional View. taken centrally of Fig. L; Fig. 6 is an elevationWpart-ly in section showing th inventibn applied directly to. the. dr ing wheels of an automobile; Fig. 7 is a sectional -=vi'ew taken on the line w m on Fig.- 6. 1001:-

"'i ISAAC sinEnEn'r,

nnrvrive IM GH nisii.

v v S pcci fic ation of Letters ll lite'nt Application fileil'october 19, 1915. seriarivo; 125,481

PATENT OFFICE.

dill YTO ing in the direetipn of the arrows; and tF g. 8, is a detail vieiv of a modified'formpf the... linventionn s i i u l In thesesdrawings I har e illustratedone 60 embodiment ofmy invention and have shown three diii'erent applications of the same to .the rear-iaXle of an automobile, but it wi l. be undeistood that the invention is notlim ited-.;to;s1,niotor driven vehicles but maybe useful. in any position in i which a compen- 'sjat'ing drive desired. In eaclrof-the three forms; of. the mechanism hereinillustratedil -l1a,ve shown .the same as. comprising'a dr'tiy i M ing mei-n ber consisting of atl leastjtwowparts VlliClli I 1(5.:(30l'lI1CGt8d together, andloneuef whiclriscapable of a. limited movement rela- ;tively to. ,tlieaothera The poweris pplied ,directl 1 o' that part of the driving member" which is movable relatively to the. other. part '15 and transmitted towsaid other part thereof by mean of a connection between the two parts.=;The. second. part is provided lith .means for connecting the same ivithfo ,or

moredriven members, such espinibnsi'br s0 .tootl-ledfwheels, on the adjacentwendslfof e two parts 01''- the axle. The devicestfipru e necting theflastmentioned panhofi the driwsa :ing member. with the driven membersih re controlled by the movement of theafirst part relatively :to the last mentioned part 2015-; Said driving member and, in the present instance, I have utilized an actuating device-Which shifted by this relative movement to actuate ratchet wheels, 3 and '4, which aare w ihere shown as ordinary spur. ears, andgavhieh constitute the driven mem ers either-mechanism. The driven members are ifspacedila apart a distance sufficient to receivehet veen them adriving member, and ion ezpartiofi the axle, in the present instance partihvprojects beyond the inner face of its drivenmember and affords a bearing for said driving memii ber. Theldriving member mayutake various formsbut preferably it consists at twwoimii 'n parts, one of which is capableot gall-imited rotatory: movement relatively to' 1' the other, and it is'shown in Figs. 1 and tim prising an inner part 5 which is cir'eu 7 form and is rotatably mounted Pi end of the part-1, of the axle;

. the-inner part 5"of'the' i i part, and consistin outer part 6 which is annular in shape and is capable of a limited circumferential movement relatively to the inner part' of the'driving member. This outer part of the driving member is provided-with means whereby power may be applied thereto, and, in the present instance, has a series of beveled gear teeth 7 adapted to mesh with the beveled pinion 8 on a driving shaft 9. Suitable means are provided for connecting together the two parts of the driving member and causing them to act as a unit, except when there is a limited relative movement as above mentioned. In the present construction the inner part 5 has rigidly secured to the opposite sides thereof guide members 10, which are here shown as annular plates rigidly sev cured to the inner part by means of rivets 11, projecting beyond the periphery of said inner-part and embracing the inner portion of the outer part of the driving member so as to retain the two parts in radial alinement but to permit the outer part to have circumferential movement on the inner part. The movement of the outer part of the drivin member relatively to the inner part thereo is limited by means ofilaterally ex.- tending projectionscarried by said'outer in the present device of a pin-12 exten ing through the same,

- and through slots 13 in the connectin plates 10. Mounted on each side of the riving member and connected with the inner part thereof is a pair of connectin devices, or pawls 14 and 15, which are a apted to be alternately moved into engagement with wheels is substantially the same the power the cooperating toothed member and to rotate the 'same in one direction or the other, and which are yieldably mounted to permit the toothed member to run aheadbf the pawl which is in operative engagement therewith. Thus when the resistance oifered to both will be applied equally. thereto, but should one wheel meet with a resistance greater than that offered to the other wheel, which resistance would have a tendency to slow down. the movement of the wheel, and consequently its toothed member which is carried by the axle, the pawl will remain in' engagement therewith and provide a direct connection between the same and the source of power, -so that the power is applied always to that wheel having the slowest movement, regardless of whether or not the other wheel is running free. Suitable con nections are established between the pawls on each side of the driving member and the outer part of the driving member to cause the positions or thepawls in relation to their,

cooperating toothed members to be reversed I bythe movement of the outer part'of the drivrn member relatively tojhe inner part thereo The inner anfl outerparts of the.

drivingiim ember'm ay be so mounted that the vdrawings, in which each the arms 17 and 18.

relatively to'the inner part thereof, when its direction 0f movement is reversed, .be-

fore movement is imparted to'the inner part 0f the driving member, thus causing the pawls to be reversed. However, to avoid any possibility of rotation being imparted to the inner part of the driving member before the outer partthereof is moved about the circumference thereof to shift the pawls,

which might be due to any one of several conditions, such as the entrance of foreign matter. into the. mechanism, I have provided means for retarding the movement of the inner part of the driving member until the relative circumferential movement of the outer part thereof has been accom lished, when the retardation will cease. Tliese results may be secured in various ways, but I prefer that shown in Figs. 1 and 2 of the air of pawls 14 and 15 is shown as pivotal y mounted on an actuating device 16, which, in turn, is pivotally mounted on the inner part of thedriving member, the axis of the actuating member being preferably arranged adjacent to the axes of the two awls; The actuating device, or plate 16 is connected with the outer part of the driving member so as to be rocked about its pivotal center by the movement of the outer part of the driving member relatively to the inner part thereof, and thereby moving one pawl away from its cooperatingtoothedmember, and moving the other pawl toward said toothed member. In

the'present instance this connection is provided by extending the pin 12 beyond the guide plates 10 and into the two actuating devices 16. The pawls '14 and 15 are shown as provided with outwardly extending arms 17 and 18 between which Is confined a stiff spring 19 which serves to hold the pawls in engagement with stops 20, when in idle position or being moved to idle position. The

stops 20am carried by the actuating device and are'arranged to the rear of therespec- The movement imparted to the actuating device 16 by the outer part ofthe driving member is greater than is necessary to move the idle pawl into operative-relation to the cooperating toothed member, and hence after the.pa.wl is in engagement with the toothed-member the actuating device will contin-ue its movement and car the stop 20 away from the arm of the paw thus enablin the full strengtli of the spring 19 to be uti ized in holdin' t e pawl in engagement with the toothe -eniemberv The ressure of the pawl againstf' thetoothed mem r offers a. frictional resistaneeltotthe relative movement of these 'parts and when the driving member is moved in. a reverse direction. the resistance ofi'ered to the movement of the pawl over the toothed member will retard the movement of the inner part of the driving member and cause the outer part thereof to be moved relatively thereto. The stop 20 having been carried beyond the arm of the pawl which is in engagement with the toothed member it will be apparent that when the direction of movement of the driving member is reversed a certain amount of initial movement will be imparted to the actuating device before the stop engages the arm of the pawl. This initial movement is sufficient to move the idle pawl into operative relation to the toothed member and the spring 19 will hold the first, or operative, pawl in engagement with the toothed member until the stop 20 has engaged its arm, when the further movement of the actuating device will lift the pawl out of engagement with the toothed member. Thus practically the full force ,of the spring is utilized to hold a the first pawl in frictional engagement with the. toothed member until the second, or idle pawl, has been moved into operative relation to the toothed member. In this manner I insure the movement of the idle pawl into its operative position upon each reversal of the directional movement of the driving member and cause the retardation of the movement of the inner part to cease as soon as the movement of the outer part of the drivin member relatively to the inner part thereo? has beencompleted. It will be understood, of course, that the tension of the spring 19 is notso great as to interfere with the ylelding movement of the pawl when the toothed member runs ahead of the driving member.

In Figs. t and. '5 I have shown another form in which the invention may be applied. A's here shown the two parts of the axle are axle are two plates 25 constitutin member 4.

provided with toothed members 3 and 4-, as.

hereinbefore described, but instead of arran ing the driving member between the toot e members it is mounted on the axle at the side thereof. As shown in these figures that part of the driving member to which the power is directly applied, which has been designated as the outer member,

com rises a beveled gear 21 which is mounted irectly upon one part of theaxle, ad:

jacent to the corresponding toothed driven Secured to the gear 21 is a frame, here shown as a housing2 mounted onthe other part of the axle and having at its outer edge a flan 0 23, which is connected 21 y. means of screws 24.

the other, or inner part, of the driving mem er. These plates are arrangedclose'to the body of the gear 21 and'to the wall of the housing 22, respectively, and, in the present instance,

are rotatably mounted on shoulders, or hubs,

formed on the respective driven members,

. tuating devices are pawls 29 similar in construction and operation to those above described. It will be noted that this form of the devicedifi'ers but little from that shown, 1n Figs. 1 and2,except in the relative positions of the parts and the difference in the construction of the outer partof the driving member to permit it to be mounted directly upon the axle. This construction follows more closely the present arrangement of compensating gearings and, under certain conditions, would be preferable.

In Figs. 6 and 7 I have shown .a further rearrangement of the mechanism to enable a one piece axleto be employed. To this end I have secured the driven members, or toothed wheels, 30, directly to the ground wheels 31, and have mounted the same loosely on the respective ends of the axle. Power is applied to the axle through the medium of the outer part of the driving member, which as here shown comprises not only the beveled gear 32, which meshes with a beveled pinion 33 one driving shaft 34,

shown as dislelike in form, and which are be obvious that it mafi'be nner. ach

but also includes plates 35, which are here 7 rigidly secured to the axle near the respective toothed members 30. Mounted on the axle between the members 35 of the outer part of the driving member and the corresponding driven members are rotatable plates 36, constituting the inner part of the driving member and carrying pawl actuating devices .37 and pawls 38, which act upon the driven members, and which are substantially the same in construction and op-' eration as those heretofore described. The a mechanism 1s inclosed within a suitable housing, which preferably constitutes a brake drum for the wheel, as shown at 39. This form of t 0 device is very compact and simple in its construction, and over- ;comes the necessity of forming the axle in two parts and at the same time provides for the relative movement of the two ground wheels. The power'filtrom the driving,mem bar will bev applied always to'that wheel which is movin at the slowest speed and the other wheel wi 1 be f, e to rntate at a speed which will accommodifte it I any condition without regard to the spe the wheel to which the power is aqpiied. In Fig. 8 of the drawings I h: ve illus trated a modified form of the device in of rotation of which the pawls, 41 and 42, of each part, are formed in a single piece and are pisotally mounted on the axis of the actuating member 43. The outer part of the pawl structure is fiat and is engaged by a spring 44 mounted at its ends in p'ins'45, carried by the actuating plate. This spring causes the pawls to move normally with the actuating plate but permits of their movement independently thereof to enable the toothed member to move relatively thereto. I

In :the ordinary operation of the mechanism there is no liability of rearward movement being imparted to the actuating device, to release the operative pawl, except when positive rearward movement is imparted to the outer part of the driving memher. The spring 19 would not have suffieient strength to shift those parts of the mechanism which'would have to move in order to permit the movement of the actuating device. However, under certain circumstances it might be desirable to provide means for positively preventing this movement of the actuating device until rearward movement had been imparted to the driving wheel, and I have shown in Figs. 1 and 2 a device which will positively lock the actuating device against movement and which will be released only by the movement of the outer part of the driving member. This device, in the form here illustrated, comprises against movement.

a latch 46 pivotally mounted on one of the plates 10 of the inner part of the driving member and having near its free end a notch or recess, 47 to receive a pin 48 which is carried by the actuating device 16. This latch is in the form of a curved arm and has on its inner side a double shoulder, or cam surface, 49, which bears against the pin 12, by means ofwhich the actuating device is t tpected with the outer part of the driving member, this pin being extended beyond the face of the actuating device to permit of this engagement. The opening in the actuating device through which the pin 12 extends is elongated in the direction of movement of the pin, as shown at 50. The cam surface 49 of the latch is so arranged with relation to the opening 50 that when the actuating device is at the extreme limit of its movement in either direction, and the pin is at the end. of the opening the cam surface will be out of alinement with the pin, thus permitting the latch to move inward about its axis until the notched end thereof has embraced the pin 48 thereby locking the actuating device Upon the first move ment of the outer part of the driving memher in a reverse direction the pin 12 will move in the opening-50 relatively to the actuating device and will rock the 'latch about its axis, away from the pin 48, freeing the actuating device and permitting the latter to move along with the outer part of the driving member when the pin 12 has engaged the end of the elongated openin 50.

When the. actuating device has reache the limit of its movement the pin will have passed the cam surface ofthe latch, thus permitting the latter to again move to its locking position. Any suitable means can-be provided for imparting inward movement to the latch, but I have, in the present instance, shown a spring 51 for imparting this movement to the latch.

The operation of the device will be clearly understood from the foregoing description and it will be apparent that I have provided a compensating driving mechanism which is very simple in 1ts construction, and is ofsuch a character that it will be very strong'and durable as is highly essential in mechanisms of this kind; that the construction is such that the larger amount of power will always be appliedto that wheel of a motor driven vehicle which meets with the greater resist ance to its movement, and therefore power will be applied where it is most needed; that either wheel can run ahead of the other without regard for the speed at which said other wheel is moving, thus absolutely eliminating the slipping of either wheel when the vehicle is traveling on a curved line; and that the construction is such that there is no liability of the pawls failing toshift when the direction of the movement of the driving mechanism is reversed, but that the shifting movement will alwaystake place and the connection between the driving member and the driven member will be direct and positive.

claims are used as a convenient method to identify the two parts of the driving member and are not intended to limit the mechanism to any particular arrangement. Althe I h in each of the three applications of the i vention here illustrated, that part of the driving member to which the power is first applied is, strictly speaking, an outer part, and the other part is an inner part, i t

'is nevertheless quite possible to otherwise arrange the mechanism without materially modifying the functions of the parts thereof, and such rearranged mechanisms be the full equivalentof those called for by the claims Having: now fully described my invention, what I claim as new and LlQSIIO to secure by- Letters Patent is Y 1. The combination with a 'driven mcm Qould bezj 'offa driving member con'rprising two part (jperatively connected to cause power to b itransmitted from oneto the other, one said "parts being capable of a limited movement relatively to the other part,

means 0 apply power to the first-mentioned part, an actuating device carried by-thc last mentioned" part, and connected with the first'-. eritioned part, and means actuated by said'dcvice toi cause power to be transmitted from said driving member through 'dFi ,tua'tin'g device to said driven member.

the combination with a rotatable drn nj me mber, of a driving member rota- 5 ta'bleabout an axis coincident with thenxis of said; driven member, and comprising two part ope 'a-tively connected to cause power to be ti'ansmitted' from one to the other,

and; one ofwhich is mounted for a limited rotatory,movement relatively to the other, meansto apply power to that part which is capable of said relative movemenhan actuating device movably mounted on said other part and connected with the first-mentioned paraand a connecting device controlled by them ement of saidactuating device to establish} a driving connection between said V driving member, said actuating device and said drivenmember s Q- B -(Eliecombination with driven members rotatable, about a common axis, of a .driv ing member comprising a part to which pow applied, said part having connected .;',l3l181\ tli,-to,reeeive power therefrom, other p artsmounted for rotation about said commoiraxis, said first-mentioned part being cap abl of a limited movement relatively to the las rmentioned parts, actuating devices noimtedmr said last-mentirmed parts and 40 connected with the first-mentioned part,

wherebythe relative movement of the firstmentioned part will shift the positions of said-nactuating devices, and,connecting detlu movement irolta-ta )h: i l; member comprislng a gear rotatable about its pa \vls rclativ'ely to said toothed mel nhc mounted fm hrotation,abolit a, oonnlnqm "said axis, plates rotatable aboutsaid common axis, arranged adjacent to the respective driven members and connected with said gear, said gear being capable of a limited rotatory movement relatively to -m said plates, actuating devices pivotally, mounted on the respectiveplates and con nected with said gear, whereby the movement of said gear relatively to'said plates will impart movement to said actuating de- 7 vices, and connecting devices controlled by. the movement of said actuating devices to establish a driving connection between said actuating devices and the respective driven members. i

i 6. The combination with a rotatable toothed member, of a driving member mounted for rotation about'the axis of said toothed member and comprising a part mounted adjacent to said toothed member, 5 and a second part operatively connected with the firstmentioned part and capable of a limited rotatory movement relatively thereto, means to apply power to the second part of. said driving member, a pair of p'awls supported by the first part of said driving member and adapted to trans- I mit power to said toothed member, and means actuated by the relative movement. I of the second part'of said driving member to simultaneously impart bodily movement to said pawls to move one of the same into and the other out of driving engagement with said toothed member, said pawls being capable of yielding movement relatively to said toothed member, whereby power may be transmitted from said second part of said driving mcml' erthrough said pawls to said toothed member, and said toothed member may 'run ahead of said driving nm'mber.

7. The combination with a rotatable toothed member, of'a driving member cone prising a partmounted adjacent to said toothed member for rotation about the ,axis

thereof, a second part capable of limited ro- V tatory movement relatlvely to the first part means to apply power to the second part-oli said drlving member, a pawl supported by the lust part of sa1ddr1ving member :Llljfl rent to said toothed member, an actuating device mounted on said first part of said -driving member and connected with said pawl to move the same intoand out of driv-p ing ungagcnu-nt with said toothed member, and connections between. saidactuat'ing devir-e and lhe second n n'l' of,saiil driving J, men hol; to cause movement of the latter .relativoly ldisaidjirsl part to shift said ar tuating device arul-apverse the positions of "8. The combinationwith toother incl of a h ui-a ms 1a agLt-nqemt o saith-l oo'th l memb 1 for rotation about the common a;

s thereof, 13 0 pable of a limited rotatory movement reladriving member, a pair of paw a second part capable of a limited rotatory movement relatively to the first part, means to apply power to the second part of said s supported by the first part of said driving member adacent to each of said toothed members, ac-

tuating devices mounted on said first part and connected with said pawls to move the same into and out of driving en agement with the respective toothed mem ers, and connections between said actuating devices and the second part of said driving member, whereby the; relative movement of the latter will cause the positions of the pawls of each pairto be reversed;

9. The combination with toothedmembers mounted for rotation about a common axis, of a driving member comprising a part mounted for rotation about'the common axis of said toothed members, a second part catively to the first mentioned part, means to apply power to said second part of said driving member, actuating devices mounted on said first-mentioned part of said driving member, pawls connecte actuating devices, arranged to be moved into drivin engagement with the respective toothed members and capable of yielding movement relatively thereto, and connections between said actuating devices and said second part of said driving member to cause said pawls to engage the'respective toothedmembers and thus cause power to be transmitted through said actuating devices and said pawls to said toothed members.

10, Thecombination with a driven member, of a driving member comprising two parts connected one to the other, one of said parts being capable of a limited movement relatively to the other part, means to apply power to the first mentioned part of said driving member, an actuating device carried by the last mentioned part ofsaid driving member and connected with said first mentioned part thereof, means actuated by said device to connect said driving member -with said driven member, and means to retard' the movement of said last mentioned part until the first mentioned part has moved relativel thereto.

11. The com ination with a toothed member, of a drivin member comprising a part mounted a jacent to said toothed member for rotation about the axis thereof, and a second part capable of a limited rotatory movement relatively to the first 'part, means to apply power to said second part of said driving' me'mber, pawls v connected with said first jart o'f'said dr ving member, means contro led -by the.movement of the second part of said-drivin member relatively to the first part" thereo to move said pawls alternately Into and out with the respective rotatable of operative relation to said toothed member, and means for 'retardin the movement of said first part of said until the second part thereof has moved relatlvely thereto.

12. The combination with toothed mem.-

bersmounted for rotation 'abouta common axis, of a driving member comprising a art mounted adjacent to said toothed mem ers for rotation about the common axis thereof, and a second part capable of a. limited rotatory movement relative to the first part, means to apply power to said second part of said drivin member, a' air of pawls carried by sai first part 0 said driving member adjacent to each of said toothed members, means controlled b the movement of the second part of said rivin member relativel to the first part thereo to move the paw s of each pair alternately into and out of operative re ation to the corresponding toothed member, and means for retarding the movement of said first part of said driving member until the second part has moved relatively thereto.

13. The combination with a rotatable toothed member, of 'a-driving' member comprising a part mounted adjacent to said toothed member for rotation about said axis thereof, and a second partcapable ofa rotatory movement relatively to said first part, means to apply power to said second part of said driving member, an actuating device movably mounted; on said first part of said driving member and connected with the second pait thereof, a pair of pawls connected with each of said actuating devices and arranged to be moved alternately into and,,out of operative relation to said toothed nfeniher, and means for retardin the movement of said, first part of said riving member until the second part thereof has moved relatively thereto.

riving member 1.4. The combination with toothed members mounted for rotation about a common axis, of a driving member comprising a art mounted adjacent to-said toothed mem rs for rotation about said common axis thereof,

and a second part capable of a limited ,ro-

tatory movement relatively to the first part, means to apply," power to the outer part of said driving member, actuating devices pivotally mounted on said inner part of said driving member and connected with the outer flirt thereof, a pair, of pawls connected. wit arranged to cooperate with t e respective toothed members, and means to retard the movement of said first part of said driving member until the second part thereof has moved relativel thereto.

;15..The com ination with toothed membei's mounted for rotation about a common a ris,of a driving member com rising a part mounted adjacent to said toot ed mem- I each of said actuatingl devices and thereof, and a second part capable of a limited rotatory movement relatively to the first vpartthereof, means to apply power to asaid secondpart of said .driving member,

pairs of oppositely extending pawls pivotally mounted on said first part of said driv ng member, means actuated by the movement of said second part of said drivfeinginmember relatively to said first part thereotto move the pawls of eachpair a1- ter-nately into andont ofoperative. relation tolgthe respective toothed members, and means to: retard the movement of saidfirst part until said second part has completed its movement relatively thereto.

1G. 'The'combination with toothed members mounted for rotation about a common axis, of a driving member comprising a parti'mounited adjacent to said toothed 1110111- mes-,ffor rotation about the common axis thereof, anda second part capable of a limited rotatory movement relatively tothe first patrtythercof, means ,to apply power to said zg' 'seeond part .otsaid driving,- -member, pairs ofaoppositely extendingpawls pivotally mounteden.said first part of saiddriving member, means actuated by the motement of said second part of said driving member d' ielatively to saul first part thereof to move the] avvls .ot ale-h pair alternately into and out et-.operative relation to the respective toothed mei'nhers, and means to'cause that ])l1;\\-- l \\'lLl(.'vl1jiS in engagement with said oothed... member to frietionally ell-gage the sa ine until the other pawl has been moved intooperative relation therito.

bersi for rotation about the common axis .157. The combination with a rotatable toothedrmcmber lo lrictionally engage thewas until the other-pawl has been'nmved -|ntoofwmtive relation thereto. j

.5:lH;-"lho 'combination' with a rotalz-dde tOUu-HNJ'llIlWHlil'lwUf aidrivin i nurin'brr; coon tl NIH ,ol sa id toothed uuanber, anda seepartcapable i Li;li'-.-:| lii-nitial' do do the said [i opl iositetv 5 said dr ving member and having ouhvardly prising.v aapart'Inup-nitrel; l'onrotathnw about rota l orv extending arms, a spring confined between. said arms, means to limit the movements of said arms under the influence of said spring,

.and means actuated by the movement of the second part of said driving member relatively to the first part thereof to move one of sald'pawls into'and theother out of 01')- erative. engagement with the cooperating toothed member. i

19. The con'ibination with toothed members mounted for rotation about a common means to apply power to the second part of said driving member, a pair of oppositely extending paw ls pivotally, mounted on said driving member adjacent to each of said toothed members, the pawls otheach panhaving; outwm'dly. extending arms, springs mnlined between said arms, means to innit the nm'vement of said arms under the inllnence of said springs, and meansjactuated by the movement of said second partof said driving member relatively to the first part thereof to more one of the panls of each pair intoand the otheront of operative engagement with the cooperating toothed inu-mber.

20. .lheicombination with toothedmeinhers mounted-for rotation about a common axis. of a driving member eon'iprising a part mounted ad acent to said toothed meinbers for rotation about the common axis thereof,

and a second part capable of a limited rotatory movement relatively to the first'part thereo'll means to apply power to thesecond part or said driving member, an actuating device movably mounted on said first part of said driving member adjacent to, each toothed nn'inbel', a connection between each of said aetlmting jdeviecsand said second part of said drivin memberto'canse move: menl to be iunmrted to theformer by the movement otthe. latter relatively to; said lii'st part ol said driving member, a. pairfof a\vls. carried by each actuating device at" ranged lo be moved.alternately: into and out of operative relation to said toothed member by [he movement of said actuating device, and a spring ttlHllllgI to hold that pawl \rhivlris in operative relation losaid toothed member In engagement thermvlthuntll the llu-rrto. I f

2|. 'lho combination with a rotatable loolhed member, ol :1 drivingmember eomother pawl is moved into operative relation prising a part mounted ;u |jacen,t to said Joolhed member for rptation@ahont the axis I ind a. seoolul pant capallrle of, a limg,

' aurora-a.

part thereof, I'm-Ems to apply 'ioiver to Said second part of said driving member, a device pivotally mounted on said first part of said driving member and connected with said second part thereof, a pair of pawls pivotally mounted on said device and arranged to be moved alternately into engagement with the cooperating toothed member by the pivotal movement of said device, said pawls having outwardly extending arms, a spring confined between said arms and stops to limit the movement of said arms by said springs.

22. The combination with toothed members mounted for-rotation about a common axis, of a' driving member comprising a pair of plates rotatably mounted about the axis of said toothed members, and a second part connected with said plates and capable of a limited rotatory movement relatively there-' to, actuating devices pivotally mounted on the respective plates and connected with the second part of said driving member, a pair of p-awls carried by each of said actuating devices and adapted to be moved alternately into and out of operative relation with the cooperating toothed member by the pivotal movement of said actuating devices.

23. The combination with toothed members mounted for rotation about a common axis, of a driving member comprising a plurality'of plates rotatableabout the axis of said toothed members, and each having a slot, and a part mounted adjacent to said platesand having pins extending through the slots in the respective plates to connect said part therewith and to allow the same to have a limited movement relatively thereto, actuating devices pivotally mounted on said plates and connected with the respective pins, a pair of pawls carried by each of said actuating devices and arranged to be moved alternately into and out of engagement with the cooperating toothed members by-the pivotal movement ofthe respective actuating devices.

24. The combination with a rotatable .toothed member, of a driving member comprising a part mounted for rotation about the axis of said toothed member, and a second part connected with said first part and. capable of a limited rotatory movement relatively thereto, means to apply power, to

said second part of said 'drifvln member, a

- pair of pawls connected with-t e first part of said driving member, means to impart bodily movement to said pawls to move one of them into and the other out of operative relation to said toothed member, said paw ls being capable ofindependent yielding'movement, and means to retain that pawl which is inoperative relation to. sald toothed mem-' her in frictional engagement therewith durin g said bodily movement.

25. The combination with a rotatable toothed member, of] a driving member comprising a part mounted for rotation about the axls oi said toothed member, and a second part connected with said first part and capa le of a limited rotatory movement relatively thereto, means to apply power to said second art of said driving member, a pair of paw s connected with the first part of said driving member, means to impart bodily movement to said pawls to move one of them into and the other out, of operative relation to said toothed member, said pawls' being capable of independent yielding movement,

and means to retain that pawl which is in operative position in engagement with said toothed member until the idle'ipawl has been moved in operative position. i

:26. The combination with a rotatable driven member, of a driving member rotatable about an axis coincident with the axis of said-driven member and comprising two parts, one of which is mounted'for a limited rotatory movement relatively to the other, means to apply power to that part which is capable of relative movement,connecting devices controlled by the relative movement of said part to connect said driving member. .w1th said driven member, and means 'controlled by the movement of said partto j hold said connecting device against move ment.

27; The combination with arotatable driven member, of a driving member'rotatable about an axis coincident with. the'axis of said driven member and comprising two parts connected one to the other, and one of which is mounted for a limited rotatory movement relatively 'to the other, means to.

apply power to that part which-is capable of said relative movement, an actuating de vice movably mounted on the other art and connected with the first mentione part, a connecting device controlled by the movement of said actuating device to connect said driving, member with said driven member,

said relatively movable part to lock said ,de;' vice against moveme'nt.- v

28'. The combination with a rotatable driven member, of a driving member'rotatable about an axis coincident w-ithethe axis of said driven member and comprisin two parts-connected one to the other, an one of which is mounted for a limited rotatory and means controlled by the movement of- 1 10 movement relatively to the other, means to apply power to'that part which is capable ment of said relatively movable part to move said locking device into an inoperative position. i

29. The combination with a rotatable driven member, of a driving member comprising a part mounted for rotation about the axis of said driven member, and a second part connected with said first mentioned part and capable of a limited rotatory movement relatively thereto, means to apply power to said second part of said driving member, an actuating device pivotally mounted on the first part of said driving member and connected with the secondpart thereof, connecting devices carried by said actuating device and adapted to be moved into and out of operative relation with said driven member by the pivotal movement of said actuating device, and means controlled by the relative movement of said second part to lock said actuating device against sa1d pivotal movement.

30. The combination With a. rotatable toothed member, of a driving member comprising a part rotatable about the axls of said toothed member, and a second part connected with the first part and capableof a limited rotatory movement relatively there ment with said actuating device, said locking device having a part arranged adjacent to the elongated opening-1n said actuating device and adapted to be engaged and actuated by said pin when said second part. moves relatively to said first part.

31. The combination with an axle, wheels loosely mounted on the respective ends of said axle, toothed members rigidly secured to said wheels, and means for rotating said a axle, of driving n'iechani'sm comprising two parts arranged adjacent to each of said toothed members, one of said parts bcmg rigidly secured to said axle and;bemg ca pable of limited movement relatively to'the other part, pawls carried by said other part and arranged to be moved alternately into engagement with the ad acent toothed member and means controlled by the n'lovemcnt of said relatively movable part to shift said pawls from one position to the other.

32. The combination with an axle, Wheels loosely n'lounted on the respective ends of toothed members,

said axle and means for rotating said axle,

of driving IIIECllflIllSll'l comprising two arts arranged a-d -acent to each of said w eels carried by said axle, one ofsaid parts-being connected with said axle andbeingcapable of a limited? rotatory movement relatively to the other part, and means controlled by the relative movement of said parts to operatively connect the last-men tioned part with the adjacent wheel when the first-mentioned part is rotated in either direction.

The combination with an loosely mounted at the respective ends thereaxle, wheels of, and means for rotating said "axle, of a driving mechanism comprising a part arranged adjacent to each of said Wheels, connections between said. parts and .saidvaxle, said connections being such, as to permit said axle to have a limited rotatory. movement relatively to said parts, and means controlled by the relative movement of said axle and said parts to operatively connect said parts with the respective wheels when said axle moves forward relatively to said parts, and to disconnect the same and maintain the same disconnected when said wheels run ahead of said axle.

34. The combination with an axle, wheels loosely mounted at the respective ends of said axle, toothed members secured to the respective wheels, and means for rotating said axle, of driving mechanism comprising parts arranged adjacent to connections between said part and said axle, said connections bein such a to permit said axle to have a limited rotatory movement relatively tov said parts, a pair of pawls carriedby each of said parts, the pawls of each'pair being arranged to move alternately into engagement with the adjacent toothed member, and means controlled by the relative movement of said shift said pawls from axle and, said parts to one position to' another, and to prevent one pawl of each pair from engagin its toothed member when the other disengaged from said toothedmembert The combination with an axle and a toothed member rotatable about the axis thereof, of a driving mcmber comprising a part mounted about said axle adjacent to said toothed member and a second part mounted about said axle and capable of a limited rotatory movement relatively to the first part, means to, apply power to said second part of said driving member, a pawl carried by said driving member and movable into engagement with said toothed member to o )eratively connect the same with said driving member, and a device connected with the secondpart of said driving mem her and arranged to act on said pawl to cause the same to be posit vely moved into pawl 0. that pair is the respective driving engagement with said toothed memsecond part of said driving member, a pair of oppositely extending paWls carried by said driving member and movable into and out of driving engagement with said toothed member to operatively connect the same with said driving member, said paw-ls being so arranged that when one is moved into 0perative engagement With said toothed 1nember the other Will be moved out of engagement therewith, a device connected with said second part of said driving member and arranged to act on said pawls to cause the same to be positively moved into and out of driving engagement with said toothed memhereto.

ISAAC S. DEMENT.

- 25 In testimony whereof, I aflix my signature 

